Asymmetric Synthesis of α-Amino Phosphonates by Using Cinchona Alkaloid-Based Chiral Phase Transfer Catalyst
作者:Weihua Li、Yifeng Wang、Danqian Xu
DOI:10.1002/ejoc.201801013
日期:2018.10.24
imines catalyzed by a cinchona alkaloid‐based chiralphase‐transfercatalyst has been developed. The process affords the desired hydrophosphonylation of imine products with quaternary stereocenters in good to high yields (up to 95 % yield) and excellent enantioselectivities (up to 99 % ee). And this straightforward protocol can be applied to gram scale reaction effectively.
Chiral Cinchona Alkaloid-Thiourea Catalyzed Mannich Reaction for Enantioselective Synthesis of β-Amino Ketones Bearing Benzothiazol Moiety
作者:Peng Lin、Baoan Song、Pinaki S. Bhadury、Deyu Hu、Yuping Zhang、Linhong Jin、Song Yang
DOI:10.1002/cjoc.201180413
日期:2011.11
were effectively catalyzed by the modified chiral cinchonaalkaloid‐derived thiourea. The reactions led to chiral β‐amino carbonyl compounds in high yields and good enantioselectivities. The study demonstrated for the first time that Mannich reactions of unmodified acetylacetone with heterocyclic imine derived from benzothiazole can be promoted by chiral bifunctional organocatalyst.